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Finding the Fourth Proportional to 687.46, 948.50 and 451.35

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Solution

The fourth proportional to 687.46, 948.50 and 451.35 is: 622.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.46 : 948.50 = 451.35 : x
  2. Step 2: Convert to fraction form
    687.46/948.50 = 451.35/x
  3. Step 3: Cross multiply
    687.46x = 948.50 × 451.35
  4. Step 4: Simplify right side
    687.46x = 428,105.48
  5. Step 5: Solve for x
    x = 428,105.48/687.46
  6. Step 6: Final answer
    x = 622.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.